Comment 1 for bug 863376

On a similar theme, when I have a song with an "&" in it and preview it, I get

Traceback (most recent call last):
  File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz/openlp.core.lib.mediamanageritem", line 516, in onSelectionChange
  File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz/openlp.core.lib.mediamanageritem", line 529, in onPreviewClick
  File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz/openlp.core.lib.mediamanageritem", line 623, in buildServiceItem
  File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz/openlp.plugins.songs.lib.mediaitem", line 509, in generateSlideData
  File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz/openlp.plugins.songs.lib.xml", line 341, in song_to_xml
  File "D:\OpenLP_Code\trunk\build\pyi.win32\OpenLP\outPYZ1.pyz/openlp.plugins.songs.lib.xml", line 450, in _add_text_with_tags_to_lines
  File "lxml.etree.pyx", line 2512, in lxml.etree.XML (src/lxml/lxml.etree.c:48057)
  File "parser.pxi", line 1545, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:71812)
  File "parser.pxi", line 1417, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:70608)
  File "parser.pxi", line 898, in lxml.etree._BaseParser._parseUnicodeDoc (src/lxml/lxml.etree.c:67148)
  File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:63824)
  File "parser.pxi", line 625, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:64745)
  File "parser.pxi", line 565, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:64088)
XMLSyntaxError: xmlParseEntityRef: no name, line 1, column 22